Precursor compounds of sodium alloy(s), for use as negative electrode active material in a sodium-ion battery, as well as to a negative electrode have the precursor compound of sodium alloy(s), as well as a sodium-ion battery having a negative electrode of this kind.

Precursor compounds of sodium alloy(s), for use as negative electrode active material in a sodium-ion battery, as well as to a negative electrode have the precursor compound of sodium alloy(s), as well as a sodium-ion battery having a negative electrode of this kind.

A method for manufacturing a ferromagnetic-particle includes preparing a manufacturing apparatus including a single mode cavity that resonates with a microwave of a predetermined wavelength; a microwave oscillator electrically connected to the single mode cavity and configured to introduce the microwave of a predetermined wavelength into the single mode cavity; a pipe disposed to pass linearly through an inside of the single mode cavity, the pipe being formed of a dielectric material; and a pump configured to introduce, from one end of the pipe, an alkaline reaction liquid in which metal ions of a ferromagnetic metal and hydroxide ions are dissolved; and reacting the reaction liquid in the pipe, introduced by the pump, by introducing the microwave into the single mode cavity so as to generate the ferromagnetic-particle in the pipe.

An object of the present invention is to provide ferrite particles having a high saturation magnetisation, and being excellent in the dispersibility in a resin, a solvent or a resin composition, a resin composition including the ferrite particles, and a resin film composed of the resin composition. The ferrite particles are a single crystalline body having an average particle size of 1 to 2000 nm, and Mn-based ferrite particles having a spherical shape, and have a saturation magnetisation of 45 to 95 Am.sup.2/kg. The resin composition includes the ferrite particles as a filler. The resin film is composed of the resin composition.

An object of the present invention is to provide ferrite particles having a high saturation magnetisation, and being excellent in the dispersibility in a resin, a solvent or a resin composition, a resin composition including the ferrite particles, and a resin film composed of the resin composition. The ferrite particles are a single crystalline body having an average particle size of 1 to 2000 nm, and Mn-based ferrite particles having a spherical shape, and have a saturation magnetisation of 45 to 95 Am.sup.2/kg. The resin composition includes the ferrite particles as a filler. The resin film is composed of the resin composition.

Disclosed herein are doped perovskite oxides. The doped perovskite oxides may be used as a cathode material in an electrochemical cell to electrochemically generate ammonia from N.sub.2. The doped perovskite oxides may be combined with nitride compounds, for instance iron nitride, to further increase the efficiency of the ammonia production.

A positive electrode includes a positive electrode active material layer, and the positive electrode active material layer includes a first lithium iron phosphate and a second lithium iron phosphate as a positive electrode active material, the first lithium iron phosphate has an average particle diameter D.sub.50 grater than that of the second lithium iron phosphate and at least one facet, and when the cross section of the positive electrode is observed with a scanning electron microscope (SEM), the cross section of the first lithium iron phosphate has at least one side having a length of 2 ?m or more.

The present application provides an iron-manganese-based positive electrode material, and a preparation method therefor and the use thereof. The preparation method comprises the steps of: S1, subjecting an inorganic compound of lithium and a Fe.sub.xMn.sub.y(OH).sub.2 precursor to oxidation sintering to obtain an intermediate product, wherein 0<x<1.0, 0<y<1.0, and x+y=1, and the ratio of the molar amount of Li in the inorganic compound of lithium to the total molar amount of Fe and Mn in the F.sub.xMn.sub.y(OH).sub.2 precursor is (0.1-0.5):1; and S2, subjecting the intermediate product to a second sintering under nitrogen or first inert gas atmosphere conditions to obtain the iron-manganese-based positive electrode material. The iron-manganese-based positive electrode material obtained by the preparation method of the present application has a relatively low content of a lithium element and a more stable structure, such that the intercalation and deintercalation process of lithium ions between the positive electrode and the electrolyte will not affect the original structure of the iron-manganese-based positive electrode material, and the cycling stability of the lithium-ion battery is further ensured.

Described herein is a battery cell having an anode or cathode comprising an acidified metal oxide (AMO) material, preferably in monodisperse nanoparticulate form 20 nm or less in size, having a pH<7 when suspended in a 5 wt % aqueous solution and a Hammett function H.sub.0>?12, at least on its surface.

A ferrite sintered body comprising Co and Fe, wherein the Co is contained in an amount of from 38 mol % to 60 mol % in terms of CoO, the Fe is contained in an amount of from 40 mol % to 50 mol % in terms of Fe.sub.2O.sub.3, and the sintered body has an average particle size of from 1.0 ?m to 5.0 ?m.